Method for transmitting and receiving signals for performing random access process in unlicensed band, and apparatus therefor

A user equipment (UE) configured transmitting a physical uplink control channel (PUCCH) in a wireless communication system, the UE comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• receiving, from a base station (BS), a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block;
• obtaining a system information from a PBCH included in the SS/PBCH block;
• transmitting, to the BS, a message A including a first Physical Random Access Channel (PRACH) and a first Physical Uplink Shared Channel (PUSCH) based on the system information;
• and
• receiving, from the BS, a message B related to contention resolution in response to the message A,
• wherein a transmission power of the message A is configured based on a power ramping counter and
• wherein a value of the power ramping counter increases based on that a transmission spatial beam for the transmission of the message A is configured identical to a transmission spatial beam related to transmission of a PRACH before the message A, and
• transmitting, to the BS, HARQ-acknowledgement (HARQ-ACK) information for the message B through the PUCCH,
• wherein a resource for transmitting the PUCCH is determined based on i) 4-bit of PUCCH resource indicator information representing a PUCCH resource from a PUCCH resource set including a plurality of PUCCH resources and ii) 3-bit of hybrid automatic repeat request (HARQ) feedback timing information representing a slot in which the PUCCH is transmitted, and
• wherein the PUCCH resource indicator information and the HARQ feedback timing information are included in downlink control information (DCI) scheduling the message B.

A processing apparatus configured to control a user equipment (UE) to operate in a wireless communication system, the processing apparatus comprising:

• at least one processor;
• and
• at least one memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• receiving, from a base station (BS), a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block;
• obtaining a system information from a PBCH included in the SS/PBCH block;
• transmitting, to the BS, a message A including a first Physical Random Access Channel (PRACH) and a first Physical Uplink Shared Channel (PUSCH) based on the system information;
• and
• receiving, from the BS, a message B related to contention resolution in response to the message A,
• wherein a transmission power of the message A is configured based on a power ramping counter and
• wherein a value of the power ramping counter increases based on that a transmission spatial beam for the transmission of the message A is configured identical to a transmission spatial beam related to transmission of a PRACH before the message A, and
• transmitting, to the BS, HARQ-acknowledgement (HARQ-ACK) information for the message B through a physical uplink control channel (PUCCH),
• wherein a resource for transmitting the PUCCH is determined based on i) 4-bit of PUCCH resource indicator information representing a PUCCH resource from a PUCCH resource set including a plurality of PUCCH resources and ii) 3-bit of hybrid automatic repeat request (HARQ) feedback timing information representing a slot in which the PUCCH is transmitted, and
• wherein the PUCCH resource indicator information and the HARQ feedback timing information are included in downlink control information (DCI) scheduling the message B.